/*
 *       Copyright (c) 2008 All rights reserved
 *               Asemantics S.r.l
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        Asemantics S.r.l."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Asemantics S.r.l.
 *    the Semantic Web company, Rome, London, Leiden and its contributors.
 *
 * 5. Neither the name of the company nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *
 */

/**
 *
 * @author Simone Tripodi (simone.tripodi)
 * @version $Id: Csv.g 2 2008-09-18 11:47:23Z simone.tripodi $
 */
grammar Csv;

@header {
    package com.asemantics.testnguice.providers;

    import java.util.ArrayList;
    import java.util.List;
}

@lexer::header {
    package com.asemantics.testnguice.providers;
}

csv returns [ List<List<String>> result ]
scope { List<List<String>> csvArgs; }
@init { $csv::csvArgs = new ArrayList<List<String>>(); }
    : line* EOF { $result = $csv::csvArgs; }
    ;

fragment
line
scope { List<String> parsedLine; }
@init { $line::parsedLine = new ArrayList<String>(); }
    : ( 
        (NEWLINE) => NEWLINE
    | field (COMMA  field)* NEWLINE { $csv::csvArgs.add($line::parsedLine); }
    )
    ;

fragment
field
    : f=QUOTED { $line::parsedLine.add($f.text); }
    | f=UNQUOTED { $line::parsedLine.add($f.text); }
    | // nothing
    { $line::parsedLine.add(null); }
    ;

COMMENT
    : EMPTY '/*' ( options { greedy=false; } : . )* '*/' { $channel=HIDDEN; }
    ;

LINE_COMMENT
    : EMPTY ('#' | '//' | '--') ~('\n'|'\r')* NEWLINE { $channel=HIDDEN; }
    ;

NEWLINE
    : '\r'? '\n'
    ;

COMMA
    : (EMPTY ',' EMPTY)
    ;

EMPTY
    : ('\t' | ' ')*
    ;

QUOTED
    : ('"' ( options { greedy=false; } : . )+ '"')+ { setText($text.substring(1, $text.length() - 1)); }
    ;

// Anything except a line-breaking character is allowed.
UNQUOTED
    : ~('\r' | '\n' | ',' | ' ')+
    ;
